To measure test-retest reliability,
you conduct the same test on the same group of people at two different points in time
. Then you calculate the correlation between the two sets of results.
What is a good test-retest reliability?
Test-retest reliability has traditionally been defined by more lenient standards. Fleiss (1986) defined ICC values
between 0.4 and 0.75 as good
, and above 0.75 as excellent. Cicchetti (1994) defined 0.4 to 0.59 as fair, 0.60 to 0.74 as good, and above 0.75 as excellent.
What are 3 ways you can test the reliability of a measure?
Reliability refers to the consistency of a measure. Psychologists consider three types of consistency:
over time (test-retest reliability), across items (internal consistency)
, and across different researchers (inter-rater reliability).
How is reliability measured?
Test-retest reliability is a measure
of reliability obtained by administering the same test twice over a period of time to a group of individuals
. The scores from Time 1 and Time 2 can then be correlated in order to evaluate the test for stability over time.
What makes good internal validity?
Internal validity is
the extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome
. … In short, you can only be confident that your study is internally valid if you can rule out alternative explanations for your findings.
What are the 4 types of reliability?
| Type of reliability Measures the consistency of… | Test-retest The same test over time. | Interrater The same test conducted by different people. | Parallel forms Different versions of a test which are designed to be equivalent. | Internal consistency The individual items of a test. |
|---|
What is an example of reliability?
The term reliability in psychological research refers to the consistency of a research study or measuring test. For example, if a person weighs themselves during the course of a day they would expect to see a similar reading. …
If findings from research are replicated consistently they
are reliable.
What are the 12 threats to internal validity?
These threats to internal validity include:
ambiguous temporal precedence, selection, history, maturation, regression, attrition, testing, instrumentation, and additive and interactive threats
to internal validity.
What can affect internal validity?
The validity of your experiment depends on your experimental design. What are threats to internal validity? There are eight threats to internal validity:
history, maturation, instrumentation, testing, selection bias, regression to the mean, social interaction and attrition
.
What factors affect internal validity?
- Subject variability.
- Size of subject population.
- Time given for the data collection or experimental treatment.
- History.
- Attrition.
- Maturation.
- Instrument/task sensitivity.
What is the most important type of validity?
Construct validity
is the most important of the measures of validity. According to the American Educational Research Associate (1999), construct validity refers to “the degree to which evidence and theory support the interpretations of test scores entailed by proposed uses of tests”.
What is validity in quantitative research?
Validity is defined as
the extent to which a concept is accurately measured in a quantitative study
. … The second measure of quality in a quantitative study is reliability, or the accuracy of an instrument.
How do you test content validity?
Content validity is primarily an
issue for educational tests
, certain industrial tests, and other tests of content knowledge like the Psychology Licensing Exam. Expert judgement (not statistics) is the primary method used to determine whether a test has content validity.
Which type of reliability is the best?
Inter-rater reliability
is one of the best ways to estimate reliability when your measure is an observation. However, it requires multiple raters or observers. As an alternative, you could look at the correlation of ratings of the same single observer repeated on two different occasions.
How do you test reliability in statistics?
Reliability can be assessed with
the test-retest method, alternative form method, internal consistency method, the split-halves method
, and inter-rater reliability. Test-retest is a method that administers the same instrument to the same sample at two different points in time, perhaps one year intervals.
